What people seem to miss is unlike the housing or gold bubble tuition costs don't really feed off each other. The high end is really just a luxury in another form and nothing is stopping Breitling from selling 300,000$ watches any time soon. And the low end is a direct government subsidy (like corn farming) which will continue as long as the government feels the need to waste money.
PS: As long as demand is unlimited and wages elastic Technology can't really destroy jobs in the long term even as it disrupts industry after industry. Still, people will always look for the best workers, so even if a degree might not mean an increase in pay the unemployment rate for people with a BS is 1/2 that of those without one for a reason.